Liquid-fuel burner



H. w. MILLER LIQUID FUEL BURNER Sept. 16, 1924. 1,509,066

Filed Oct. 8, 1923 I; Wmn

dig q Patented Sept. 16, 1924.

onrrsn stares 1,509,066 rarest" caries.

HARRY W. MILLER, OF CHICAGO, ILLINOIS, ASSIGNOB TO ALADDIN OILv BURNER, CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LIQUID-FUEL BURNER.

Application filed October 8, 1923.

To all whom it may oonoem:

Be it known that I, HARRY W. MILLER, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Liquid- Fuel Burners, of'which the following is a specification. 7

This invention relates to liquid fuel burners of the injector type, and in which the liquid fuel is initially atomized by aflow of compressed air, and the fuel thus atomized is projected into the combustion chamber of a furnace by a flow of air from a low pressure blower or like source, and the present improvement has for its various obects: 3 To provide a structural formation and combination of the parts of a burner head wherein the liquid fuel is supplied in an even and continuous manner from the discharge opening of the jet tube, into the zone of a concentrically arranged compressed air passage, to attain an effective atomizing of the; liquid fuel, in thepath of a flow of air from a low pressure blower or other source, and by which flow of air the atomized fuel is projected into the combustion chamber of a furnace.

To provide a structural formation and arrangement of pilot light parts, whereby a flow of blower air through the burner head, the flame of the pilot light will be deflected late-rally into the path of the atomized liquid fuel to insure an ignition of the same,

all as will hereinafter more fully app-ear.

In the accompanying draw1ng: Flg. 1, is a central vertical section of a liquid fuel burner head embodying the present invention. V

F ig. 2, is a bottom view of the same.

Like reference numerals indicate like parts in both views.

In the present structure the pipe or conduit 1 through which the supply of low pressure air from a blower or like source, is introduced into the burner head of the apparatus, passes horizontally through a side wall of the furnace and is supported by said wall in any suitable manner. At its inner end the pipe 1 has connection with a side neck 2 of the burner head now to be described.

The burner head comprises a vertically arranged shell or casing, preferably of a- Serial No. 667,192.

circular shape and formed at its upper end with a neck 3 for attachment of the centrally arranged jet head of the apparatus, and at its lower endwith an open neck at formed to receive an annular bushing 5, capable of ready removal and replacement as it becomes unduly worn or defective by continued actual use.

The axially arranged jet head 6 above re ferred to, is of an elongated form, the upper end of which is provided with a screw threaded orificefor the reception of the,

lower end of an attaching bolt 7 extending down through a removable plug 8 fitted to the upper neck 8 of theaforesaid enclosing shell.

ply is introduced into the cavity 9, while the upper counterbore or cavity 10 has a lateral connection midway its height with 'a' supply pipe or passage 12 through which a supply of liquid fuel from a suitable source of supply is introduced into the cavity. 10.

At the lower end of the jet head 6, and in its cavity 9and annular ring or bushing 13 is fitted by the usual screw thread 'connection, with the central bore of the bushing 13 adapted to: encircle the hereinafter described jet tube of the appliance with an annular passage between the parts for a do-wnflow of compressed air from the cavity 8. In the present construction the lower end of the "bushing 18 is of a conical form and is provided with a series of concentric ridges 14 as shown, adapted to resist an outward creeping tendency of a liquid fuel that may pass onto the lower end of the bushing.

The jet tube 15, above referred to, is formed with a screw threaded upper end adapted for engagement in the lower end of the counterbore 10 of the jet head 6, with the extreme upper end of the tube formedwith an upstanding nipple 16, extending above the supply passage 12, and adapted to convert the upper portion of the counter- The lower portion of the jet head 6'is I bore 10 into an expansion chamber acting to provide an even and uniform downflow of the liquid fuel through the jet tube 15. In the present structure the lower portion of the jet tube is of a cylindrical form, with its lower end extending a short distance below the lower end of the aforesaid annular bushing 13, and forming in connection with the central bore of said bushing, the above described annular passage for compressed air from the cavity 9, to effect a proper atoinizing of the liquid fuel as it leaves the jet tube 15 in the actual operation of the appliance.

Another portion of the invention consists in the provisions of a pilot light 1'? at one side of the jet head 6, adjacent to the annular bushing 13 and jet tube 15, and adapt-- ed, on a cessation of operation of the present fuel burning device, to direct a jet of flame in a downward direction into the furnace chamber to ignite any combustible gases which may remain in said chamber. The pilot light 1'? receives its supply of gas through a supply pipe 1.8 and passage 19 formec inside of the jet head 6 as shown.

A funnel shape passage 20 is former in a side portion of the jet head 6 in adjacent lateral relation to the pilot light 17, and at its upper end is in communication with the interior of the enclosing shell of the burner head and adapted to receive blower or low pressure air therefrom. At its lower end the passage 20 is branched laterally to provide lateral jet opening 21 in line with the iuidlength ot the ct of lame from the pilot light 17, and is adapted with a existence of blower pressure in the said enclosing shell of the burner head and in said passage 20, to deflect said flame laterally across the path of the aton'iized fuel from the jet tube 15 and annular bushing 13,

and cause an ignition of such fuel in an initial starting or restarting of the apparatus.

Having thus fully described my invention, what I claim and desire to secure by Letters Patent is 1. In a burner head for liquid fuel burners, thecombination of an enclosing shell having inlet and outlet necks, a jet head arranged centrally in said shell and formed with a lower bore and an upper counterbore, a compressed air supply connected to said lower bore, a liquid fuel supply connected to said counterbore, a jet tube connected to the lower end of said counter-bore and having a nipple extending up above the fuel inlet thereof, and an annular bushing fitting the lower end of said lower bore with its orifice encircling the lower portion of the jet tube and forming an annular air pas sage around the nne, the annular bushing having a conical lower end formed with a series 015 concntric ridges.

2. In a burner head for liquid fuel burners, the combination of an enclosing shell formed with top, bottom. and side necks, an air supply pipe conuectedwith the side neck of the shell, a bushing fitting the upper neck of the shell, an annular bushing fitting the lower neck of the shell, a jet head arrang d cenn'ally in said shell and attached to bushing of the upper neck by an attaching bolt, said jet head having upper and lower bores, liquid fuel supply connected to said upper bore, a compressed air supply connected to said lower bore, a jet tube connected to the lower end of said upper bore, and an annular bushing fitting the lower end of the lower bore with its orifice encircling the jet tube and forming an annular air passage around the same. i

3. In a burner head for liquid fuel burners, the combination of an enclosing shell having inlet and outlet necks, a jet head arranged centrally in said shell and provided with liquid fuel and compressed air outlets at its lower end, a pilot light arranged at one side of the jet head, and a funnel shape passage connected at one end with the interior of the enclosing shell and at its other end having a lateral outlet adapted to discharge jet of air against the frame of the pilot light to deflect the same across the outlets of the jet head.

Signed at Chicago, Illinois, this 5th day of October, 1923.

HARRY W. MILLER. 

